Our city for municipal construction, the government has just purchased our company 4MW solar system to charge buses on city road on 6th，December.
The off-grid solar power system uses solar panels to convert solar energy to electricity with light, supply the load through the solar charge and discharge controller, and charge the battery; in dark weather or no light, the battery unit by the DC load to the battery controller, and the battery directly to the independent inverter, through the independent inverter inverter to AC, to supply the AC load.Off-grid solar power generation system is widely used in remote mountainous areas, power-free areas, islands, communication base stations and other application places.The system is generally composed of photovoltaic square array composed of solar cell module, solar charge and discharge controller, battery pack, off-grid inverter, DC load and AC load.The photovoltaic square converts solar power to electric power with light, supply the load through the solar charge and discharge controller, and charge the battery pack, the battery will supply the DC load through no light, and the battery will also directly supply the independent inverter, turn the inverter to AC to supply the AC load.
Factors to be considered in the design of solar power systems:
1. Where is the solar power generation system used?What is the solar light radiation situation in the area?
2. How much is the load power of the system?
3. What is the output voltage of the system, DC or AC?
4. How many hours does the system need to work every day?
5. In case of rainy weather without sunlight, how many days does the system need continuous power supply?
6. Load situation, pure resistivity, capacitance or electrical sensibility, how much is the starting current?
The main part of the solar off-grid power generation system, but also the most valuable component of the system, is to convert the solar energy of radiation energy into DC energy.According to the user’s different power and voltage requirements, the solar cell components can be made into a single use, or several solar cell components can be connected in series (to meet the voltage requirements) and in parallel (to meet the current requirements), to form a power supply array to provide greater current power.Solar cell components are characterized by high area specific power, long life and high reliability. In the 20-year service period, the output power drops by generally no more than 20%.With the change of temperature, the current, voltage and power of the battery pack will also change, so the negative voltage and temperature coefficient must be taken into account in the series design of the components.
Post time: Dec-06-2021